Your Windows 11 PC might be hiding a 500GB storage bug - how to check

Windows 11 PC might be hiding a 500GB storage bug - how to check">

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Do you have a sneaking suspicion that your Windows PC is losing disk space? If so, it may not be your imagination, at least not if your system has been hit by a known bug.

A particular file in Windows 11 can grow to the point that the loss in disk space becomes noticeable. The culprit here is a system file named CapabilityAccessManager.db-wal, as spotted and described by Windows Latest .

Part of the Capability Access Manager Service, this otherwise obscure file manages the permissions granted to applications to access the camera, microphone, location, and other privacy-minded features. The db-wal extension indicates that this file stores any changes in a write-ahead log before they're written to the main database.

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The file itself can certainly grow as it needs to keep track of more data. However, it should top out at no more than a megabyte or two. Instead, the bug in Windows seems to cause it to expand to as much as 500GB, according to one Redditor who posted a message a year ago (yep, it's been around at least that long).

How can you tell if you're affected by this bug? One way is to check the size of your Windows system files.

To do that, go to Settings, select System, and then click Storage. Under the first bar image, click the link for "Show more categories." If the category for System & reserved shows no more than two or three dozen gigabytes, then you're in the clear. But if it indicates a size that stretches beyond 100GB, then your system is likely affected by the bug.

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I checked all my Windows 11 environments, including those directly on PCs and those in virtual machines. On all except one, the size for this category ranged anywhere from 5GB to 25GB. But on my primary Windows 11 laptop, the size hit 151GB.

Okay, but how do you know that CapabilityAccessManager.db-wal is to blame for the growth?

The file itself is housed in the following location: C:\ProgramData\Microsoft\Windows\CapabilityAccessManager. However, Windows denies you access to that folder by default, and I don't suggest changing the permissions on a system folder even if you know how.